I'm really confused by the comments. Most of them don't seem to think anything is wrong, but this is clearly a completely different manga. Was it originally uploaded correctly and then got changed later somehow?
The chapter numbers here bear little resemblance to those on the author's Pixiv page. In fact I don't think there's anything missing between 29 & 32.
Mangadex chapters 27 - 29 are all from Pixiv chapter 24
Mangadex chapter 29.5 is Pixiv chapter 25
Mangadex chapters 32 - 34 are all from Pixiv chapter 26